I have a 2001 E-150 that has a cylinder #1 and #2 misfire. Weird thing is it only happen's when it rain's really hard or i hit a big water puddle. Plug wires are all new and snapped on correctly. Water doesn't seem to be getting up on top of the engine. It goes away pretty quickly after the rain stop's. Could something other than plug wire's be causing it as they are new? Any help would be appreciated Thanks.